WO2013039148A1 - 磁気カップリングポンプの駆動装置及び磁気カップリングポンプユニット - Google Patents
磁気カップリングポンプの駆動装置及び磁気カップリングポンプユニット Download PDFInfo
- Publication number
- WO2013039148A1 WO2013039148A1 PCT/JP2012/073468 JP2012073468W WO2013039148A1 WO 2013039148 A1 WO2013039148 A1 WO 2013039148A1 JP 2012073468 W JP2012073468 W JP 2012073468W WO 2013039148 A1 WO2013039148 A1 WO 2013039148A1
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- WIPO (PCT)
- Prior art keywords
- magnetic coupling
- magnet
- coupling pump
- pump
- drive device
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/021—Units comprising pumps and their driving means containing a coupling
- F04D13/024—Units comprising pumps and their driving means containing a coupling a magnetic coupling
- F04D13/026—Details of the bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/021—Units comprising pumps and their driving means containing a coupling
- F04D13/024—Units comprising pumps and their driving means containing a coupling a magnetic coupling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/021—Units comprising pumps and their driving means containing a coupling
- F04D13/024—Units comprising pumps and their driving means containing a coupling a magnetic coupling
- F04D13/025—Details of the can separating the pump and drive area
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/046—Bearings
- F04D29/047—Bearings hydrostatic; hydrodynamic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/046—Bearings
- F04D29/048—Bearings magnetic; electromagnetic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
- F04D29/628—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for liquid pumps
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K49/00—Dynamo-electric clutches; Dynamo-electric brakes
- H02K49/10—Dynamo-electric clutches; Dynamo-electric brakes of the permanent-magnet type
- H02K49/104—Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element
- H02K49/106—Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element with a radial air gap
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/0606—Canned motor pumps
- F04D13/0626—Details of the can
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
- H02K7/11—Structural association with clutches, brakes, gears, pulleys or mechanical starters with dynamo-electric clutches
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
Definitions
- the present invention relates to a driving device for a magnetic coupling pump that rotates an impeller provided with a permanent magnet as a driven magnet by rotating a permanent magnet as a driving magnet, and a magnetic cup including the driving device. It relates to a ring pump unit.
- Patent Document 1 As a magnetic coupling pump unit, for example, there is one disclosed in Patent Document 1 below.
- the pump of the magnetic coupling pump unit described in Patent Literature 1 includes an impeller and a fixed body on which a hydrodynamic bearing portion that supports the impeller so as to be rotatable about a rotation axis is formed. .
- the impeller is provided with a driven magnet formed of a permanent magnet.
- the driving device for rotating the impeller of the pump has rotating magnetic field generating means for generating a rotating magnetic field that rotates around the rotation axis while being magnetically coupled to the driven magnet of the pump.
- the present invention pays attention to the problems of the above prior art, and a magnetic coupling pump drive device capable of suppressing the influence of external magnetic flux leakage and external magnetic field, and a magnetic coupling pump unit including the same The purpose is to provide.
- a drive device for a magnetic coupling pump for solving the above problems
- a driving device for a magnetic coupling pump having an impeller rotatable around a rotation axis and a driven magnet formed of a permanent magnet and fixed to the impeller, a mounting portion on which the magnetic coupling pump is mounted;
- a magnet holding ring having a cylindrical portion formed around the rotation axis of the magnetic coupling pump mounted on the mounting portion and having the drive magnet fixed inside the cylindrical portion; , Formed of a paramagnetic material and a motor for rotating the magnet holding ring around the rotation axis of the magnetic coupling pump mounted on the mounting portion, forming a cylindrical shape with a gap inside. Characterized in that it and a magnetic shield body having a cylindrical portion to which the magnet holding ring is arranged.
- the drive magnet since the drive magnet is fixed inside the magnet holding ring formed of a ferromagnetic material, the magnetic flux directed outward and the circumferential direction of the magnetic flux formed by the driven magnet and the drive magnet.
- the magnetic flux passes through the magnet holding ring with the magnet holding ring formed of a ferromagnetic material as a part of the magnetic circuit.
- the quantity which the magnetic flux formed with a driven magnet and a drive magnet leaks outside from a magnet holding ring can be made very small.
- a magnetic shield body made of a paramagnetic material is arranged at an interval on the outside of the magnet holding ring, so that the passage of magnetic flux from the inside to the outside of the magnetic shield body is suppressed. be able to.
- the drive device even if a magnetic body exists outside the magnetic shield body, it is possible to suppress the magnetic flux from the external magnetic body from passing through the inside of the magnetic shield body formed of a paramagnetic material. . Furthermore, in the drive device, since the magnet holding ring made of a ferromagnetic material is arranged inside the magnetic shield body, leakage of magnetic flux from the outside to the inside of the magnet holding ring can be suppressed.
- the first magnetic shield method that actively allows magnetic flux to pass through the member (magnet holding ring formed of a ferromagnetic material) and suppresses leakage of the magnetic flux from the member;
- the second magnetic shield method that suppresses the passage of magnetic flux to the member (magnetic shield body formed of paramagnetic material)
- the magnetic flux leakage to the outside and the influence of the external magnetic field can be effectively suppressed.
- the driving device after suppressing leakage of magnetic flux from the member (magnet holding ring formed of a ferromagnetic material) to the outside by the first magnetic shield method, Since the passage of the magnetic flux to the outside is suppressed, the leakage of the magnetic flux to the outside can be suppressed extremely effectively.
- the drive device may include a drive device casing that covers the magnet holding ring and the motor, and the drive device casing may include the mounting portion and the magnetic shield body.
- This drive unit can suppress the influence of magnetic flux leakage to the outside of the drive unit casing and the magnetic field outside the drive unit casing.
- the drive magnet may be formed of a neodymium magnet.
- the drive device uses a neodymium magnet with extremely high magnetic force, the drive magnet can be reduced in size and weight, the drive device can be reduced in size and weight, and the rotational inertia force of the rotating body can be reduced. .
- the cylindrical portion of the magnetic shield body may be formed with a cooling fin having a convex shape on the outer peripheral side toward the outer side.
- the temperature rise inside the magnetic shield body and the magnetic shield body can be suppressed. For this reason, for example, when an Nd magnet having a relatively high magnetic force but a large decrease in magnetic force accompanying a temperature rise is used as the drive magnet, the magnetic force drop accompanying the temperature rise can be suppressed.
- At least the cylindrical portion of the magnetic shield body may be formed of an aluminum alloy that is the paramagnetic material.
- the drive device since at least the cylindrical portion of the magnetic shield body is formed of an aluminum alloy having a relatively small specific gravity, the drive device can be reduced in weight. Furthermore, since at least the cylindrical portion of the magnetic shield body is formed of an aluminum alloy having a relatively high thermal conductivity, the heat dissipation effect can be enhanced.
- the magnetic coupling pump unit according to the invention for solving the above problems is
- the drive device and the magnetic coupling pump has a pump casing that rotatably covers the impeller, and the drive magnet is mounted on the mounting portion. It is characterized by being arranged with an interval outside the pump casing with respect to the rotation axis.
- An impeller capable of rotating around a rotation axis, a driven magnet formed of a permanent magnet and fixed to the impeller, and a permanent magnet, spaced from the driven magnet with respect to the rotation axis
- a magnet holding the drive magnet which is formed of a ferromagnetic material and has a cylindrical portion that is cylindrical with the rotation axis as the center, and the drive magnet is fixed inside the cylindrical portion Ring
- a magnetic shield body having a portion.
- These magnetic coupling pump units are also provided with the same magnet holding ring and magnetic shield body as those of the above drive device, so that the influence of the magnetic flux leakage to the outside and the external magnetic field can be suppressed.
- the impeller has a cylindrical portion whose outer peripheral surface forms a cylindrical shape around the rotation axis, and the pump casing covers the cylindrical portion of the impeller,
- the inner peripheral surface may have a cylindrical shape, and may have a dynamic pressure bearing forming portion that rotatably supports the cylindrical portion without contact.
- the impeller In the magnetic coupling pump unit, the impeller can be rotatably supported without contact with the pump casing.
- the influence of magnetic flux leakage to the outside and the external magnetic field can be suppressed.
- FIG. 3 is a sectional view taken along line III-III in FIG. 1. It is sectional drawing of the magnetic coupling pump in one Embodiment which concerns on this invention. It is the schematic diagram which drew typically the longitudinal cross-section of the magnetic coupling pump unit in one Embodiment which concerns on this invention. It is a principal part cross-sectional view of the magnetic coupling pump unit in one Embodiment which concerns on this invention. It is a principal part cross-sectional view of the magnetic coupling pump unit as a comparative example.
- the magnetic coupling pump unit 1 of the present embodiment includes a magnetic coupling pump 100 and a drive device 200 that drives the magnetic coupling pump 100 as shown in FIGS.
- the magnetic coupling pump 100 of the present embodiment includes a hermetic impeller 10 and a pump casing 60 that covers the impeller 10 so as to be rotatable about the rotation axis A.
- a discharge port (see FIGS. 1 and 2) 7 for discharging a fluid is formed, and a suction port 6 for sucking the fluid is formed on an extension line of the rotation axis A. .
- the suction port 6 side of the pump casing 60 is the front side, and the opposite side is the rear side.
- the direction side approaching the rotation axis A is the inside, and the direction side away from the rotation axis A is the outside.
- the impeller 10 includes a plurality of blades 11 provided around the rotation axis A, a front shroud 20 that covers the front side of the plurality of blades 11, and a rear shroud 40 that covers the rear side of the plurality of blades 11. ing. As described above, the impeller 10 forms a sealed impeller by covering the front and rear of the plurality of blades 11 with the front shroud 20 and the rear shroud 40. The plurality of blades 11, the front shroud 20, and the rear shroud 40 of the impeller 10 are joined to each other.
- the front shroud 20 has a cylindrical shape with the rotation axis A as the center, and an inlet cylinder portion 21 that forms an impeller inlet 12 whose front opening in the axial direction Da faces the suction port 6 of the pump casing 60, and an inlet cylinder portion 21 and a front side plate portion 31 that covers the front side of the plurality of blades 11.
- the rear shroud 40 includes a rear plate portion 41 that covers the rear sides of the plurality of blades 11, and a columnar shaft portion 51 that is provided at the rear end of the rear plate portion 41 and that has a rotation axis A as a center. ing.
- the shapes of the front side plate portion 31 of the front shroud 20 and the rear side plate portion 41 of the rear shroud 40 as viewed from the axial direction Da are both circular around the rotation axis A.
- the front side plate portion 31 and the rear side plate portion 41 are separated from each other in the axial direction Da, and a plurality of blades 11 are fixed between the front side plate portion 31 and the rear side plate portion 41.
- the outer edge in the radial direction Dr between the front side plate portion 31 and the rear side plate portion 41 forms the impeller outlet 13.
- An impeller inner flow passage Pr is formed in the inlet cylinder portion 21 and between the front plate portion 31 and the rear plate portion 41 and between the plurality of blades 11.
- the shaft portion 51 of the rear shroud 40 has a through-hole 56 that passes through the rotation axis A in the axial direction Da and communicates between the rear end surface 53 of the shaft portion 51 and the pump casing 60 and the flow path Pr in the impeller. Is formed.
- the shaft 51 has a cylindrical driven yoke 19y made of a ferromagnetic material and a plurality of driven made of permanent magnets at a position between the outer peripheral surface 52 and the inner peripheral surface of the through hole 56.
- a magnet 19 is embedded.
- the plurality of driven magnets 19 are provided on the outer periphery of a cylindrical driven yoke 19y.
- the pump casing 60 has a pump front casing 61 that covers the front shroud 20 of the impeller 10 and a pump rear casing 81 that covers the rear shroud 40 of the impeller 10.
- the pump front casing 61 includes a substantially cylindrical suction hose connection pipe portion 62 to which a suction hose is connected, and a diameter expansion pipe having an inner diameter gradually increased from the rear end toward the rear side of the suction hose connection pipe portion 62.
- a front bearing forming portion 67 provided with a portion 65 and an inner peripheral surface 68 provided at the rear end of the diameter-expanded tube portion 65 and facing the outer peripheral surface 22 of the inlet cylinder portion 21 of the front shroud 20 with a gap therebetween;
- a front casing main body 71 provided at the rear end of the front bearing forming portion 67 and covering the front side plate portion 31 of the front shroud 20.
- the front end of the suction hose connection pipe portion 62 is open, and this opening forms the suction port 6 of the pump casing 60.
- the front casing main body portion 71 extends outward from the rear end of the front bearing forming portion 67 and faces the front surface 32 of the front side plate portion 31 of the front shroud 20 with a spacing in the axial direction Da with a space therebetween.
- a front main body cylinder portion 75 that has a substantially cylindrical shape around the rotation axis A and extends rearward from the outer peripheral edge of the front facing portion 72.
- the shape of the inner peripheral surface 76 of the front main body cylinder portion 75 in a cross section perpendicular to the rotation axis A is a volute shape.
- the inner peripheral surface 76 of the front main body cylinder portion 75 faces the outer peripheral edge of the front side plate portion 31 of the front shroud 20 with a space therebetween.
- the pump rear casing 81 is provided at the rear end of the front casing main body 71 and covers the rear plate part 41 of the rear shroud 40, and the shaft 51 of the rear shroud 40 provided on the rear casing main body 91.
- a rear bearing forming portion 82 formed with an inner peripheral surface 83 facing the outer peripheral surface 52 with a space therebetween, and a distance between the shaft portion 51 of the rear shroud 40 and the axial direction Da provided at the rear end of the rear bearing forming portion 82.
- a flat plate-shaped rear wall plate portion 85 facing each other.
- the rear casing main body 91 has a substantially cylindrical shape centering on the rotation axis A, and extends from the rear end of the front casing main body 71 to the rear side, and from the rear end of the rear main body cylindrical portion 92 to the inner side.
- a flat plate ring-shaped rear surface facing portion 95 facing the rear surface 42 of the rear shroud 40 and spaced apart in the axial direction Da.
- a rear bearing forming portion 82 is provided on the inner edge of the rear surface facing portion 95 so as to extend rearward therefrom.
- the pump casing 60 has a substantially cylindrical discharge hose connection pipe portion 9 to which a discharge hose is connected, as shown in FIGS. 1 and 2.
- the axis Ad of the substantially cylindrical discharge hose connecting pipe portion 9 is parallel to a plane perpendicular to the rotation axis A.
- the discharge hose connection pipe portion 9 is divided into two in the front-rear direction on a plane passing through the axis Ad, and one is provided as a connection pipe front split portion 78 in the front main body cylinder portion 75 of the pump front casing 61.
- the other is provided as a connecting pipe rear split portion 98 in the rear main body cylindrical portion 92 of the post-pump casing 81.
- the outer end of the discharge hose connection pipe portion 9 is open, and this opening forms the discharge port 7 of the pump casing 60.
- the pre-pump casing 61 and the post-pump casing 81 are each integrally molded products made of resin.
- the pre-pump casing 61 and the post-pump casing 81 are joined by an adhesive.
- the driving device 200 is fixed to a motor 210 having a rotating output shaft 211, a bottomed cylindrical cup (magnet holding ring) 220, and an inner peripheral side of the cup 220.
- the cup 220 is made of, for example, carbon steel such as SS400, which is a ferromagnetic material, and serves as a yoke for the plurality of drive magnets 219.
- the cup 220 includes a cylindrical cup cylinder portion 221 and a flat plate motor connection portion 225 that closes one opening of the cup cylinder portion 221.
- An output shaft 211 of the motor 210 is fixed on the motor connecting portion 225 and on the extension line of the shaft of the cup cylindrical portion 221.
- a plurality of drive magnets 219 are fixed to the inner peripheral side of the cup cylindrical portion 221 as described above.
- the drive magnet 219 is a permanent magnet, for example, an Nd (neodymium) magnet.
- the inner diameter of the cup cylindrical portion 221 is larger than the outer diameter of the rear bearing forming portion 82 of the post-pump casing 81. Further, the length twice the distance in the radial direction from the axis of the cup cylindrical portion 221 to the inner surface of each drive magnet 219 (hereinafter referred to as a magnet arrangement diameter) is outside the rear bearing forming portion 82 of the post-pump casing 81. It is larger than the diameter.
- the driving device casing 230 has a bottomed cylindrical casing body (magnetic shield body) 231 and a cap 241 that closes the opening of the casing body 231.
- the casing body 231 is made of, for example, an Al (aluminum) alloy that is a paramagnetic material.
- the casing main body 231 has a cylindrical casing cylindrical portion 232 having an inner diameter larger than the outer diameter of the cup 220 and the outer diameter of the motor 210, and a flat plate-shaped casing bottom portion 235 that closes one opening of the casing cylindrical portion 232. is doing.
- the motor 210 is placed in the casing body 231 and fixed to the casing bottom 235 with screws or the like.
- a part of the outer periphery of the casing cylindrical portion 232 has a concavo-convex shape in the radial direction Dr, and the convex portion forms the radiation fin 233.
- a power cable plate 234 for passing a power cable of the motor 210 is formed in another part of the casing cylindrical portion 232.
- the cap 241 is formed of a resin such as engineering plastic, for example.
- the cap 241 has a bottomed cylindrical shape, a pump fitting portion 242 into which the rear bearing forming portion 82 and the rear wall plate portion 85 are fitted inside, and a bottomed cylindrical pump fitting portion.
- a pump receiving portion 244 that extends outward from the opening edge of 242 and forms a flat ring shape, and an engaging portion 246 that is formed on the outer peripheral edge of the pump receiving portion 244 and engages with the opening edge of the casing body 231.
- the cap 241 constitutes a mounting portion on which the magnetic coupling pump 100 is mounted.
- the inner diameter of the bottomed cylindrical pump fitting portion 242 is substantially the same as the outer diameter of the rear bearing forming portion 82 of the pump casing 60. Therefore, the rear bearing forming portion 82 of the pump casing 60 can be fitted into the pump fitting portion 242 of the cap 241. Further, the pump fitting portion 242 has an outer diameter smaller than the inner diameter of the cup cylindrical portion 221 and the above-described magnet arrangement diameter, and the driving magnet fixed to the cup 220 in the bottomed cylindrical cup 220. 219 enters without contact.
- the operator When driving the magnetic coupling pump 10, the operator first connects the suction hose to the suction hose connection pipe 62 of the magnetic coupling pump 100 and connects the discharge hose to the discharge hose connection pipe 9.
- the rear bearing forming portion 82 of the pump casing 60 is fitted into the pump fitting portion 242 of the cap 241 of the drive device casing 230, and the magnetic coupling pump 100 is attached to the drive device 200. At this time, the rear surface facing portion 95 of the pump casing 60 and the pump receiving portion 244 of the cap 241 are in contact with each other. Next, the pump casing 60 is fixed to the drive device casing 230 by the lock member 250.
- the magnetic coupling pump unit 1 has a driven magnet 19 embedded in the shaft portion 51 of the magnetic coupling pump 100 and a driving magnet 219 fixed to the cup 220 of the driving device 200.
- the magnets are magnetically coupled to each other in the direction Dr.
- the output shaft 211 of the motor 210 is located on an extension line of the rotation axis A of the magnetic coupling pump 100.
- the magnetic coupling pump 100 is attached to the driving device 200 after the suction hose and the discharge hose are connected.
- the suction hose and the discharge hose may be connected after the magnetic coupling pump 100 is attached. .
- the shaft portion 51 of the impeller 10 is arranged inside the plurality of drive magnets 219, and the driven magnet 19 is embedded in the shaft portion 51.
- the outer diameter of the shaft portion 51 of the impeller 10 can be made smaller than arranging magnets. Therefore, according to the present embodiment, the impeller 10 can be reduced in size and weight, and the inertial force related to the rotation of the impeller 10 can be reduced.
- the fluid that has entered the impeller channel Pr receives centrifugal force from the rotating blades 11, flows out of the impeller outlet 13, and then is discharged from the discharge port 7 of the pump casing 60.
- Part of the fluid flowing out from the impeller outlet 13 is formed between the inner surface 73 of the front facing portion 72 of the front casing 61 of the pump and the front surface 32 of the front plate portion 31 of the front shroud 20 to form the front bearing of the front casing 61 of the pump. It returns between the inner peripheral surface 68 of the portion 67 and the outer peripheral surface 22 of the inlet cylinder portion 21 of the front shroud 20 and returns to the inside of the expanded pipe portion 65 of the pump front casing 61. Then, it enters the impeller inner flow path Pr again from the impeller inlet 12.
- the bus on the inner peripheral surface 68 of the front bearing forming portion 67 of the front casing 61 of the pump and the bus on the outer peripheral surface 22 of the inlet cylinder portion 21 of the front shroud 20 are parallel to each other.
- the distance between the inner peripheral surface 68 of the front bearing forming portion 67 and the outer peripheral surface 22 of the inlet tube portion 21 is constant in the axial direction Da.
- vertical with respect to the rotating shaft A of the inner peripheral surface 68 of the front bearing formation part 67 of the pump front casing 61 and the outer peripheral surface 22 of the inlet cylinder part 21 of the front shroud 20 is a circle.
- the inner peripheral surface 68 of the front bearing forming portion 67 and the outer peripheral surface 22 of the inlet tube portion 21 form a dynamic pressure radial bearing surface, respectively, and the fluid flowing between the both surfaces 68 and 22 functions as a lubricating fluid. . Therefore, the impeller 10 is supported by the pump casing 60 so that the portion of the inlet cylinder portion 21 of the impeller 10 can rotate in a non-contact manner in the radial direction Dr.
- Dr the rotational speed of the impeller 10 is low, such as when the impeller 10 starts rotating, a part of the inner peripheral surface 68 of the front bearing forming portion 67 and a part of the outer peripheral surface 22 of the inlet tube portion 21 are mutually connected.
- the inlet cylinder portion 21 When the impeller 10 is in contact and the rotational speed of the impeller 10 is equal to or higher than the predetermined rotational speed, the inlet cylinder portion 21 is lifted with respect to the inner peripheral surface 68 due to the dynamic pressure of the fluid acting between the both surfaces 68 and 22. As described above, the inlet cylinder portion 21 of the impeller 10 is rotatably supported by the inner peripheral surface 68 without contact.
- the bus bar of the inner peripheral surface 83 of the rear bearing forming portion 82 of the post-pump casing 81 and the bus bar of the outer peripheral surface 52 of the shaft portion 51 of the rear shroud 40 are parallel to each other.
- the distance between the inner peripheral surface 83 of the rear bearing forming portion 82 and the outer peripheral surface 52 of the shaft portion 51 is constant in the axial direction Da.
- the cross-sectional shapes perpendicular to the rotational axis A of the inner peripheral surface 83 of the rear bearing forming portion 82 of the rear casing 81 and the outer peripheral surface 52 of the shaft portion 51 of the rear shroud 40 are all circles.
- the inner peripheral surface 83 of the rear bearing forming portion 82 and the outer peripheral surface 52 of the shaft portion 51 form a dynamic pressure radial bearing surface, respectively, and the fluid flowing between the inner peripheral surface 83 and the outer peripheral surface 52 flows. Functions as a lubricating fluid. Therefore, the impeller 10 is supported by the pump casing 60 so that the shaft portion 51 of the impeller 10 can rotate in a non-contact manner in the radial direction Dr. Note that the shaft portion 51 of the impeller 10 also has a part of the inner peripheral surface 83 of the rear bearing forming portion 82 and the outer peripheral surface 52 of the shaft portion 51 when the rotational speed of the impeller 10 is low, like the inlet tube portion 21.
- the parts 51 are in contact with each other, and when the rotational speed of the impeller 10 becomes equal to or higher than a predetermined rotational speed, the shaft portion 51 floats with respect to the inner peripheral surface 83 due to the dynamic pressure of the fluid acting between the both surfaces 83 and 52. Then, the shaft portion 51 of the impeller 10 is supported by the inner peripheral surface 83 so as to be rotatable without contact.
- the two locations of the inlet cylinder portion 21 and the shaft portion 51 of the impeller 10 are supported by the inner peripheral surfaces 68 and 83 so as to be rotatable in a non-contact manner in the radial direction Dr. Then, the impeller 10 is supported on both ends so as to be rotatable in a non-contact manner in the radial direction Dr. Moreover, the impeller 10 is supported at two locations on the front side and the rear side with reference to the position of the center of gravity. Therefore, according to the present embodiment, the impeller 10 can be stably supported even when a moment around an axis perpendicular to the rotation axis A is generated.
- the outer diameter of the shaft portion 51 of the impeller 10 can be reduced, the peripheral speed of the shaft portion 51 can be suppressed. Therefore, according to this embodiment, the shear strain acting on the fluid flowing between the outer peripheral surface 52 of the shaft portion 51 and the inner peripheral surface 83 of the rear bearing forming portion 82 of the post-pump casing 81 can be reduced. For example, when jelly-like grains or the like are mixed in the fluid, damage to the grains or the like can be suppressed.
- the position of the impeller 10 in the axial direction Da with respect to the pump casing 60 is held by the magnetic coupling force between the driven magnet 19 in the impeller 10 and the drive magnet 219 of the drive device 200.
- the position of the impeller 10 held by the magnetic coupling force in the axial direction Da is a position where the surface of the impeller 10 and the surface of the pump casing 60 facing each other in the axial direction Da do not contact each other. That is, in this embodiment, the impeller 10 is supported so as to be rotatable in a non-contact manner also in the axial direction Da.
- the impeller 10 is rotated together with the driven magnet 19 by rotating the drive magnet 219 that is magnetically coupled to the driven magnet 19 embedded in the impeller 10.
- the magnetic flux from a driven magnet or a drive magnet may leak outside, and it may have a bad influence on external electronic equipment etc. .
- the magnetic coupling balance between the drive magnet and the driven magnet may be lost, and the stable rotation of the impeller may be impaired.
- a casing body formed of an Al (aluminum) alloy which is a bottomed cylindrical and paramagnetic material on the outermost periphery with the rotation axis A as the center.
- a cup (magnet holding ring) 220 as a yoke formed of carbon steel such as SS400, which is a cylindrical material with a bottomed cylindrical shape and a ferromagnetic material, is arranged on the inside thereof, and this cup ( A plurality of drive magnets 219 are fixed to the inner peripheral side of the magnet holding ring) 220, and a plurality of driven magnets 19 are arranged at intervals on the inner peripheral side (rotation axis A side) of the plurality of drive magnets 219.
- the drive magnet 219 is fixed to the inner peripheral side of the cup (magnet holding ring) 220 made of a ferromagnetic material, the magnetic flux formed by the driven magnet 19 and the drive magnet 219 Of these, the outward magnetic flux and the circumferential magnetic flux ⁇ t pass through the cup 220 with a cup (magnet holding ring) 220 formed of a ferromagnetic material as a part of the magnetic circuit. For this reason, in this embodiment, the amount of magnetic flux formed by the driven magnet 19 and the drive magnet 219 leaks outside the cup 220 can be extremely reduced. Furthermore, in the present embodiment, a casing body (magnetic shield body) 231 formed of a paramagnetic material is provided outside the cup 220 with an interval (air gap) therebetween. The passage of magnetic flux to the outside can be suppressed.
- the leakage of magnetic flux to the outside of the drive device casing 230 can be minimized.
- the magnetic flux from the magnetic body passes through the inside of the casing body (magnetic shield body) 231 formed of a paramagnetic material. Can be suppressed. Furthermore, in this embodiment, since a cup (magnet holding ring) 220 formed of a ferromagnetic material is disposed inside the casing body (magnetic shield body) 231, the magnetic flux from the outside to the inside of the cup 220 can be reduced. Leakage can be suppressed.
- leakage of magnetic flux from the member (cup 220 formed of a ferromagnetic material) to the outside is suppressed by the first magnetic shield method, and further outside by the second magnetic shield method. Since the passage of the magnetic flux to is suppressed, leakage of the magnetic flux to the outside can be suppressed extremely effectively.
- an Nd magnet is used as the drive magnet 219. While this Nd magnet has a very high magnetic force, it has the property that the change in magnetic force accompanying a temperature change is large.
- the temperature coefficient indicating the change in magnetic force accompanying the temperature change is -0.03
- the Nd magnet Has a large temperature coefficient of -0.09 to -0.12. That is, although the Nd magnet has a higher magnetic force than the Sm-Co magnet, the rate of decrease in magnetic force accompanying a temperature rise is large.
- the drive magnet 219 formed of an Nd magnet is rotated together with the cup 220 to cool the drive magnet 219 with air, and the radiating fins 233 are attached to the casing body 231 that covers the outer periphery of the drive magnet 219.
- the temperature rise of the drive magnet 219 is suppressed.
- a hydrodynamic bearing type pump is exemplified as an example of the pump.
- the present invention is not limited to the hydrodynamic bearing type pump.
- the present invention may be applied to any pump as long as it is a rotating type pump.
- the magnetic coupling pump 100 is detachable from the driving device 100.
- the pump may not be detachable from the driving device, and the pump and the driving device are integrated. There may be.
- the drive device does not have to be provided with a mounting portion to which the pump is mounted.
Abstract
Description
本願は、2011年9月15日に、日本に出願された特願2011-201851号に基づき優先権を主張し、その内容をここに援用する。
回転軸線回りに回転可能な羽根車と、永久磁石で形成され該羽根車に固定されている従動磁石とを有する磁気カップリングポンプの駆動装置において、前記磁気カップリングポンプが装着される装着部と、前記装着部に装着された前記磁気カップリングポンプの回転軸線を基準にして、該磁気カップリングポンプの前記従動磁石より外側に間隔をあけて該従動磁石と対向する駆動磁石と、強磁性材で形成され、前記装着部に装着された前記磁気カップリングポンプの回転軸線を中心として筒状を成す筒部を有し、該筒部の内側に前記駆動磁石が固定されている磁石保持環と、前記装着部に装着された前記磁気カップリングポンプの回転軸線回りに、前記磁石保持環を回転させるモータと、常磁性材で形成され、筒状を成し、内側に間隔をあけて前記磁石保持環が配置されている筒部を有する磁気シールド体と、を備えていることを特徴とする。
前記駆動装置と、前記磁気カップリングポンプとを備え、前記磁気カップリングポンプは、前記羽根車を回転可能に覆うポンプケーシングを有し、前記駆動磁石は、前記装着部に装着された前記ポンプの回転軸線を基準にして、前記ポンプケーシングよりも外側に間隔をあけて配置されていることを特徴とする。
回転軸線回りに回転可能な羽根車と、永久磁石で形成され、前記羽根車に固定されている従動磁石と、永久磁石で形成され、前記回転軸線を基準にして前記従動磁石よりも外側に間隔をあけて配置されている駆動磁石と、強磁性材で形成され、前記回転軸線を中心として筒状を成す筒部を有し、該筒部の内側に前記駆動磁石が固定されている磁石保持環と、
前記磁石保持環を前記回転軸線回りに回転させるモータと、常磁性材で形成され、前記回転軸線を中心として筒状を成し、内側に間隔をあけて前記磁石保持環が配置されている筒部を有する磁気シールド体と、を備えていることを特徴とする。
6 吸込口
7 吐出口
9 吐出ホース接続管部
10 羽根車
11 羽根
12 羽根車入口
13 羽根車出口
19 従動磁石
20 前シュラウド
21 入口筒部
22 (入口筒部の)外周面
31 前側板部
32 前面
40 後シュラウド
41 後側板部
42 後面
51 軸部
52 (軸部の)外周面
53 (軸部の)後端面
56 貫通孔
60 ポンプケーシング
61 ポンプ前ケーシング
62 吸込ホース接続管部
65 拡径管部
67 前軸受形成部
68 (前軸受形成部の)内周面
71 前ケーシング本体部
72 前面対向部
73 (前面対向部の)内面
75 前本体筒部
81 ポンプ後ケーシング
82 後軸受形成部
83 (後軸受形成部の)内周面
85 後壁板部
91 後ケーシング本体部
92 後本体筒部
95 後面対向部
96 (後面対向部の)内面
100 磁気カップリングポンプ
200 駆動装置
210 モータ
211 出力軸
219 駆動磁石
220 カップ(磁石保持環)
230 駆動装置ケーシング
231 ケーシング本体(磁気シールド体)
241 キャップ(装着部)
Claims (8)
- 回転軸線回りに回転可能な羽根車と、永久磁石で形成され該羽根車に固定されている従動磁石とを有する磁気カップリングポンプの駆動装置において、
前記磁気カップリングポンプが装着される装着部と、
前記装着部に装着された前記磁気カップリングポンプの回転軸線を基準にして、該磁気カップリングポンプの前記従動磁石より外側に間隔をあけて該従動磁石と対向する駆動磁石と、
強磁性材で形成され、前記装着部に装着された前記磁気カップリングポンプの回転軸線を中心として筒状を成す筒部を有し、該筒部の内側に前記駆動磁石が固定されている磁石保持環と、
前記装着部に装着された前記磁気カップリングポンプの回転軸線回りに、前記磁石保持環を回転させるモータと、
常磁性材で形成され、筒状を成し、内側に間隔をあけて前記磁石保持環が配置されている筒部を有する磁気シールド体と、
を備えていることを特徴とする磁気カップリングポンプの駆動装置。 - 請求項1に記載の磁気カップリングポンプの駆動装置において、
前記磁石保持環及び前記モータを覆う駆動装置ケーシングを備え、
前記駆動装置ケーシングは、前記装着部及び前記磁気シールド体を有する、
ことを特徴とする磁気カップリングポンプの駆動装置。 - 請求項1又は2に記載の磁気カップリングポンプの駆動装置において、
前記駆動磁石は、ネオジウム磁石で形成されている、
ことを特徴とする磁気カップリングポンプの駆動装置。 - 請求項1から3のいずれか一項に記載の磁気カップリングポンプの駆動装置において、
前記磁気シールド体の前記筒部は、外周側に、前記外側に向って凸形状の冷却フィンが形成されている、
ことを特徴とする磁気カップリングポンプの駆動装置。 - 請求項1から4のいずれか一項に記載の磁気カップリングポンプの駆動装置において、
前記磁気シールド体の少なくとも前記筒部は、前記常磁性材であるアルミニウム合金で形成されている、
ことを特徴とする磁気カップリングポンプの駆動装置。 - 請求項1から5のいずれか一項に記載の磁気カップリングポンプの駆動装置と、
前記磁気カップリングポンプと、を備え、
前記磁気カップリングポンプは、前記羽根車を回転可能に覆うポンプケーシングを有し、
前記駆動磁石は、前記装着部に装着された前記ポンプの回転軸線を基準にして、前記ポンプケーシングよりも外側に間隔をあけて配置されている、
ことを特徴とする磁気カップリングポンプユニット。 - 回転軸線回りに回転可能な羽根車と、
永久磁石で形成され、前記羽根車に固定されている従動磁石と、
永久磁石で形成され、前記回転軸線を基準にして前記従動磁石よりも外側に間隔をあけて配置されている駆動磁石と、
強磁性材で形成され、前記回転軸線を中心として筒状を成す筒部を有し、該筒部の内側に前記駆動磁石が固定されている磁石保持環と、
前記磁石保持環を前記回転軸線回りに回転させるモータと、
常磁性材で形成され、前記回転軸線を中心として筒状を成し、内側に間隔をあけて前記磁石保持環が配置されている筒部を有する磁気シールド体と、
を備えていることを特徴とする磁気カップリングポンプユニット。 - 請求項6又は7に記載の磁気カップリングポンプユニットにおいて、
前記羽根車は、前記回転軸線を中心として外周面が円筒状を成す円筒部を有し、
前記ポンプケーシングは、前記羽根車の前記円筒部を覆い、内周面が円筒状を成して、該円筒部を非接触で回転可能に支持する動圧軸受形成部を有する、
ことを特徴とする磁気カップリングポンプユニット。
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BR112013011539-4A BR112013011539B1 (pt) | 2011-09-15 | 2012-09-13 | unidade de acionamento para uma bomba de acoplamento magnético e unidade de bomba de acoplamento magnético |
US13/989,456 US9188127B2 (en) | 2011-09-15 | 2012-09-13 | Drive unit of magnetic coupling pump and magnetic coupling pump unit |
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BR112013011539A2 (pt) | 2016-08-09 |
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CN103180616A (zh) | 2013-06-26 |
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US20140023535A1 (en) | 2014-01-23 |
JP2013066258A (ja) | 2013-04-11 |
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